Omega2S Reset Pin C21 shutdown instead of reset
Jeff Seese last edited by
I am having a problem with the Omega2S/Omega2S+ Reset pin C21.
Per the documentation C21 is the power on reset.
My boards have a 10k Pullup on that pin with a momentary pushbutton to ground.
Grounding C21 does cause the Omega2S to shut down, but it does not boot back up with out a power cycle.
The desired functionality is a full reset of the Omega2S with out a power cycle.
Does anybody else have similar results or a real hard reset solution?
@Jeff-Seese Omega2s will reset, but won't be able to boot because the flash chip is still configured in 4 byte mode while the omega expects 3 byte mode after reset. You need to reset the omega2s and the flash together.
@wdu said in Omega2S Reset Pin C21 shutdown instead of reset:
Omega2s will reset, but won't be able to boot because the flash chip is still configured in 4 byte mode while the omega expects 3 byte mode after reset.
Excuse me please but this confused me a little.
If I know well Omega (Winbond 25Q128FV), Omega2 (Winbond W25Q128BV) and Omega2S (probably same or fully equivalent flash than Omega2) each of them has a 128 Mbit / 16 MByte SPI serial flash with 24 bit (A23-A0) ie. 3 byte address.
Please correct me if I'm wrong.
@György-Farkas The + versions have 32 mbyte flash, which cannot be addressed in 3 byte mode. The power on reset for the flash is 3 byte mode, after boot they are switched to 4 byte address mode.
I only have experience with the + versions. I do not know if the normal versions use 3 or 4 byte addressing mode.
@wdu OK So the missing + was a typo (only ;). Thank you.
Does anybody else have ... a real hard reset solution?
Here you are a "brute force" solution by Onion for the HW_RST button problem of Omega2S+.
It should work theoretically if you put a resistor between the base (1) and emitter (2) of the Q2 PNP transistor.
I wonder what about in practice because I do not have such devices.